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AWS EC2 Network Access Control List Deletion

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AWS EC2 Network Access Control List Deletion

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Identifies the deletion of an Amazon Elastic Compute Cloud (EC2) network access control list (ACL) or one of its ingress/egress entries.

Rule type: query

Rule indices:

filebeat-*
logs-aws*

Severity: medium

Risk score: 47

Runs every: 10 minutes

Searches indices from: now-60m (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

References:

Tags:

Elastic
Cloud
AWS
Continuous Monitoring
SecOps
Network Security

Version: 101 (version history)

Added (Elastic Stack release): 7.9.0

Last modified (Elastic Stack release): 8.6.0

Rule authors: Elastic

Rule license: Elastic License v2

Potential false positives

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Network ACL’s may be deleted by a network administrator. Verify whether the user identity, user agent, and/or hostname should be making changes in your environment. Network ACL deletions by unfamiliar users or hosts should be investigated. If known behavior is causing false positives, it can be exempted from the rule.

Investigation guide

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Rule query

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event.dataset:aws.cloudtrail and event.provider:ec2.amazonaws.com and
event.action:(DeleteNetworkAcl or DeleteNetworkAclEntry) and
event.outcome:success

Threat mapping

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Framework: MITRE ATT&CK^TM

Tactic:
- Name: Defense Evasion
- ID: TA0005
- Reference URL: https://attack.mitre.org/tactics/TA0005/
Technique:
- Name: Impair Defenses
- ID: T1562
- Reference URL: https://attack.mitre.org/techniques/T1562/

Rule version history

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Version 101 (8.6.0 release)

Formatting only

Version 100 (8.5.0 release)

Formatting only

Version 9 (8.4.0 release)

Formatting only

Version 7 (8.1.0 release)

Formatting only

Version 6 (7.13.0 release)

Updated query, changed from:

event.action:(DeleteNetworkAcl or DeleteNetworkAclEntry) and
event.dataset:aws.cloudtrail and event.provider:ec2.amazonaws.com and
event.outcome:success

Version 5 (7.12.0 release)

Formatting only

Version 4 (7.11.2 release)

Formatting only

Version 3 (7.11.0 release)

Formatting only

Version 2 (7.10.0 release)

Formatting only

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